A recent survey asked 64 CMU students, “In the past year, about how many books did...
A recent survey asked 64 CMU students, “In the past year, about how many books did your read?” The results indicated a mean of 16.8 books with a S.D. of 6,7 books.
- What is the Margin of Error at a C.L. of 97%?
- What is the right boundary of the C.I. at a C.L. of 97%?
- At a 99% C.L., if the researcher wants to limit the error within 1.5 book range, what size of the sample is needed?
Homework Answers
Margin of Error at a C.L. of 97% is =1.859 (Note :this should be 1.817 with z distribution)
right boundary of the C.I. at a C.L. of 97% =18.659 (Note :this should be 18.617 with z distribution)
size of the sample is needed =(zσ/E)2 =133
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